GJ.1, Un Real blue, type 4, pen cancelled, VF quality (Image)

GJ.1, Un Real blue, type 6, pen cancelled, defects, good opportunity (Image)

GJ.4, 5c. yellow-green, type 3, VF (Image)

GJ.6, 2c. lemon yellow, type 7, with interesting pen cancel, VF (Image)

GJ.7, 3c. dark blue, VF quality (Image)

GJ.7, 3c. dark blue, type 4, with gum (Image)

GJ.13, 3c. dull rose, double circle datestamp of Corrientes for 25/JUL/1877, small defect, superb appearance (Image)

GJ.16, 3c. dull rose, type 4, with gum (Image)

GJ.16, 3c. lilac-rose, type 6, original gum, excellent (Image)

GJ.16, 3c. lilac-rose, type 2, with VARIETY: top right angle flattened due to hammer flow, VF quality (Image)

6 Hamburg forgeries, some with forged cancels (one of Santa Lucía), interesting for study (Image)